Reserve Unit Control - Watts AERCO Edge [ii] Operation Manual

Edge [ii] Controller Operation Manual
SECTION 6 – ADVANCED SETUP
2. In Select Output, choose either:
•
Cascade Valve: For use with AERCO supplied valves.
•
Aout 2: For controlling non-AERCO supplied valves.
3. The following parameters appear for both values of Select Output:
Output Signal Type: Select the output signal type of the selected output: Current
•
or Voltage.
Control Mode: Choose one: On/Off, Linear Modulation or Delta T Modulation.
•
Valve Feedback: Choose Enabled or Disabled. If Enabled, the following additional
•
parameters appear:
o Valve Feedback Status: A read-only display of the current valve status.
o Valve Feedback Timer: The time to detect the Valve Feedback Status
(Range: 30 to 240 sec.)
Valve Balancing: If you wish to implement the Valve Balancing feature on the
•
cascade, set this parameter to Enabled, then go to
and complete the instructions there.
Min # Valves Open: This parameter appears only if Unit Mode = BST Manager
•
(see Section 6.3.1: Cascade
valves that must stay open at all times, including during plant standby conditions. The
number specified appears on the Isolation Valve Status screen (see
Isolation Valve
loads and helps reduce the flow rate during plant standby. To determine the value for
Min # Valves Open, use the following formula, rounding up the result to the higher
number:
Min # Valves Open = (Pump's minimum flow rate / Boiler maximum flow
4. The following parameters appear only if Select Output = Aout 2:
A. Open Vlv Control Signal: Select the signal that will "fully open" the valve: 0 mA,
4 mA or 20 mA.
B. Close Vlv Control Signal: Select the signal that will "fully close" the valve: 0 mA,
4 mA or 20 mA.

Reserve Unit Control

The Reserve Unit Control screen allows you to enable the Reserve Unit Control feature, which
will activate a "Reserve Unit" in the event the plant cannot keep up with the system load.
NOTE:
This screen is available only after BST Cascade functionality has been enabled (see the
Unit Mode parameter in
a BST Manager, its parameters apply to this unit and all BST Client units. If the unit is
configured as a BST Client, the parameters configured on the BST Manager will take
precedence.
Main Menu → Advanced Setup → BST Cascade → Operating Controls →
1. Go to:
Reserve Unit Control.
•
OMM-139_E 8/25/2020
Configuration). Specify the minimum number of isolation
Status). This ensures the boiler's maximum flow is not exceeded at low
Section 6.3.1: Cascade
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Section 6.3.4.8: Valve Balancing
Configuration). If the unit is configured as
Section 7.5:
rate).
Page 135 of 196